book Maths Puzzle Numerical Ability

I have problems working with multi-step equations, can you help me please?
Thank you!

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book Other Question

A = 1/2h(B+b)

area of a trapezoid

solve for b
You deposit $2000 in your account tat pays 5% conpounded continuosly and monthly. what is your balance after 2 years. Solve it.